Respectively, closer to the older D6C and D6D. All used the Cat 3306T 6-cylinder engine. The D6R replaced the D6H in 1996, and came in five models ranging from the 165 hp (123 kW) D6R to the 175 hp (130 kW) D6R XL and XR, and the 185 hp (138 kW) D6R XL (IG) and D6R LGP.This was the first D6 with Caterpillar's elevated drive sprocket undercarriage. The D6H was introduced in 1986 along with 3 other H-Series track-type tractors.In 1977 the D6D with a 140 hp (100 kW) engine was introduced, as well as the D6D SA version with 125 hp (93 kW) (drawbar) for agricultural use.In 1959 the D6 was replaced with the D6B after 60,000 D6 4R/5R and 8U/9U tractors had been built.The D6 4R/5R was replaced by the D6 8U & 9U series, fitted with the 6-cylinder D318 engine of 66 hp (49 kW) in 1947.
A Caterpillar D6R with Power Angle Tilt blade
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